JP2001201206A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner which can perform heating stably without affecting the room temperature, when switching is made between heating operation using an indoor heat exchanger supplied with hot water and heating operation using an indoor heat exchanger supplied with a refrigerant. SOLUTION: The air conditioner comprises a refrigeration cycle, comprising a refrigerant compressor 12 and an indoor heat exchanger 5a supplied with the refrigerant, and a hot water circulation circuit comprising a hot water control valve 6 and an indoor heat exchanger 5b supplied with hot water, where heating operation is performed using any one of the indoor heat exchanger 5a supplied with refrigerant or the indoor heat exchanger 5b supplied with hot water. When switching is made between heating operation, using the indoor heat exchanger 5a supplied with refrigerant and heating operation using the indoor heat exchanger 5b supplied hot water, a controller 18 performs combines operation of both heating operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an air conditioner provided with a refrigeration cycle having a refrigerant heat exchanger and a hot water circulation circuit having a hot water heat exchanger.

[0002]

2. Description of the Related Art Generally, a refrigeration cycle including a refrigerant compressor, an outdoor heat exchanger, an electric expansion valve, an indoor heat exchanger to which a refrigerant is supplied, a heater, a hot water heat exchanger, a hot water control valve, and the like. 2. Description of the Related Art There is known an air conditioner that includes a hot water circulation circuit including an indoor heat exchanger to which hot water is supplied, and that enables cooling and heating. The indoor heat exchanger is provided with a refrigerant pipe and a hot water pipe, and the indoor heat exchanger is cooled or heated, and the indoor heat exchanger and the indoor air exchange heat to cool or heat the air. Air to the room.

In this type, the heating operation is switched between heating using an indoor heat exchanger supplied with hot water and heating using an indoor heat exchanger supplied with refrigerant. Heating is performed using an indoor heat exchanger to which hot water is supplied at the time of high load, such as when heating starts or when the outside air temperature is low, and low load such as when the room temperature is stable or when the outside air temperature is warm. It is sometimes desirable to perform heating using an indoor heat exchanger to which a refrigerant is supplied.

[0004]

However, simply switching between heating using an indoor heat exchanger to which hot water is supplied and heating using an indoor heat exchanger to which refrigerant is supplied, causes the refrigerant to be switched when switching. A temperature difference may occur between the heat exchanger supplied with the hot water and the heat exchanger supplied with the hot water, which may affect the blowout temperature. The temperature of one of the indoor heat exchangers, one of the heat exchanger to which the refrigerant is supplied and the heat exchanger to which the hot water is supplied, suddenly drops too much, and the temperature of the indoor heat exchanger suddenly rises too fast. There is a problem that a hunting phenomenon occurs in which the operation of the heat exchanger is frequently switched.

The present invention has solved the above-mentioned conventional problems. When a low capacity heating operation is required, heating using an indoor heat exchanger to which hot water is supplied is stopped, and refrigerant is supplied. Energy saving operation by switching to heating using an indoor heat exchanger, and switching between heating using an indoor heat exchanger supplied with hot water and heating using an indoor heat exchanger supplied with refrigerant. It is an object of the present invention to provide an air conditioner that can switch stably without affecting the room temperature.

[0006]

In order to achieve the above object, the present invention is directed to a refrigeration cycle including a refrigerant compressor, an indoor heat exchanger to which a refrigerant is supplied, and the like, a hot water control valve, A hot water circulation circuit including an indoor heat exchanger to which hot water is supplied, and a heating operation using either an indoor heat exchanger to which refrigerant is supplied or an indoor heat exchanger to which hot water is supplied. When switching between a heating operation using an indoor heat exchanger to which refrigerant is supplied and a heating operation to use an indoor heat exchanger to which hot water is supplied in an air conditioner, a refrigerant is supplied to the indoor heat exchanger. And a control device that performs a combined operation of a heating operation using an indoor heat exchanger supplied with hot water and a heating operation using the same.

According to a second aspect of the present invention, in the air conditioner according to the first aspect, the control device opens the hot water control valve when the room temperature is equal to or lower than a third temperature lower than the set temperature, and the room temperature is set to the set temperature. It is characterized in that it is controlled to close when the temperature rises to a fourth temperature which is lower than the third temperature and higher.

According to a third aspect of the present invention, in the air conditioner according to the second aspect, the control device sets the refrigerant compressor to a first temperature whose room temperature is lower than the fourth temperature and higher than the third temperature. When the temperature rises, the operation is started, and when the room temperature falls below the second temperature lower than the third temperature, the operation is stopped so that the operation is stopped.

According to a fourth aspect of the present invention, there is provided a refrigeration cycle including a refrigerant compressor, an indoor heat exchanger to which a refrigerant is supplied, a hot water control valve, an indoor heat exchanger to which hot water is supplied, and the like. An air conditioner that includes a hot water circulation circuit and performs a heating operation using one of an indoor heat exchanger supplied with refrigerant and an indoor heat exchanger supplied with hot water. Heating operation using an indoor heat exchanger supplied with a refrigerant and an indoor heat exchanger supplied with hot water when switching between heating operation using a heat exchanger and heating operation using an indoor heat exchanger supplied with hot water The controller has a controller that performs the combined operation of the heating operation using the controller, and the controller controls the temperature of the indoor heat exchanger to which the refrigerant is supplied and the temperature of the indoor heat exchanger to which the hot water is supplied after the combined operation is started. After a certain time elapses after And performing combined operation continues until.

According to a fifth aspect of the present invention, in the air conditioner of the fourth aspect, when the heating operation is performed using the indoor heat exchanger to which the hot water is supplied, the fifth temperature is lower than the set temperature. When rising to, the air conditioner switches the operation to heating operation using the indoor heat exchanger to which the refrigerant is supplied, and when performing the heating operation using the indoor heat exchanger to which the refrigerant is supplied, When the room temperature decreases to a sixth temperature lower than the fifth temperature, the air conditioner switches the operation to a heating operation using an indoor heat exchanger to which hot water is supplied.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an indoor unit and 2 denotes an outdoor unit, which are connected by refrigerant pipes. Reference numeral 3 denotes a heat source unit, which is connected to the indoor unit 1 by a hot water pipe. These constitute the air conditioner 4.

An indoor heat exchanger 5 is housed in the indoor unit 1, and the indoor heat exchanger 5 is supplied with a refrigerant incorporating a refrigerant pipe 16 through which a refrigerant (Freon) flows. Hereinafter, it is simply composed of a refrigerant indoor heat exchanger 5a) and an indoor heat exchanger (hereinafter simply referred to as a hot water indoor heat exchanger 5b) supplied with hot water incorporating a hot water pipe 26 through which hot water flows. The refrigerant indoor heat exchanger 5a is arranged more upstream than the hot water indoor heat exchanger 5b. Indoor unit 1
A variable flow rate valve 6 (hot water control valve) is provided between the hot water pipe 26 at the hot water inlet and the hot water indoor heat exchanger 5b, and the hot water flowing into the hot water indoor heat exchanger 5b by adjusting the valve opening. Can be adjusted. Reference numeral 7 denotes a blower, which sucks air from a suction port of the indoor unit, heats or cools the sucked air by the indoor heat exchanger 5, and then blows the air into the room. A room temperature sensor 8 is provided at the suction port to detect room temperature.

The outdoor unit 2 houses a refrigerant compressor 12, an outdoor heat exchanger (for refrigerant) 13, a four-way valve 14, an accumulator 15, and the like. A refrigeration cycle (refrigerant circulates in the direction of the solid arrow to perform a cooling operation, and circulates in the direction of a dotted arrow to perform a heating operation) is connected to the expansion valve 17 and the like.

Numeral 18 denotes a control unit, which controls the refrigerant compressor 12,
A temperature comparison unit is connected to the variable flow rate valve 6 and the room temperature sensor 8 and compares the difference between the room temperature detected by the room temperature sensor 8 and the set temperature. Based on the temperature comparison means, the cooling capacity and the heating capacity are controlled by controlling the rotation speed of the refrigerant compressor 12 and the valve opening of the variable flow rate valve 6.

The cooling capacity and the heating capacity of the refrigerant indoor heat exchanger 5a can be changed by changing the rotation speed of the refrigerant compressor 12. The rotation speed can be changed by using an induction motor as a drive source of the refrigerant compressor 12 and changing the frequency of the AC power supplied to the refrigerant compressor 12 using an inverter device.

Reference numeral 21 denotes a muffler.
Numeral 1 is for reducing the refrigerant noise of the refrigerant circulating in the refrigeration cycle.

The heat source unit 3 houses a heater 22 (for example, a gas burner), a hot water heat exchanger 23, a pump 24, a pressure tank 25, and the like. These are the hot water indoor heat exchanger 5b housed in the indoor unit 1, Along with the variable valve 6, it is connected in a ring by a hot water pipe 26 to form a hot water circulation circuit for heating.

According to this, by changing the amount of heating by the heater 22 and the amount of circulation of hot water by the variable flow rate valve 6,
It is possible to control the amount of heat radiation in the hot water indoor heat exchanger 5b.

Reference numeral 27 denotes a reserve tank, which stores excess hot water in the hot water circulation circuit, and the portion overflowing from the reserve tank 27 is drained as drain.

Reference numeral 28 denotes a pressurized water injection valve, and 29 denotes a pressurized water injection device for injecting hot water (water) into the hot water circulation circuit.

Numeral 16a is a piping between the units for the refrigerant,
Reference numeral 26a denotes an inter-unit pipe for hot water, which connects the indoor unit 1 to the outdoor unit 2 and the indoor unit 1 to the heat source unit 3, respectively. The heating amount (combustion amount) of the heater 22 is a predetermined value (for example, 80 ° C.)
The temperature is automatically controlled so as to be a constant temperature selected and determined by the user, such as ℃ or 60 ℃.

In the above configuration, the refrigerant flows through the refrigerant pipe 16,
When circulating in the direction of the solid line arrow 16a, the refrigerant discharged from the refrigerant compressor 12 passes through the four-way valve 14 and the outdoor heat exchanger 13 and is decompressed by the electric expansion valve 17, so that the refrigerant is cooled by the refrigerant indoor heat. Since the surrounding air is cooled by evaporating in the exchanger 5a, the conditioned room is cooled. Conversely, when the refrigerant is circulating in the refrigerant pipes 16 and 16a in the direction of the dotted line arrows, the refrigerant discharged from the refrigerant compressor 12 passes through the four-way valve 14 and radiates heat in the refrigerant indoor heat exchanger 5a to turn around the air. Is heated, so that the harmonized room is heated. In addition, hot water is hot water pipe 2
6, 26a, when circulating in the hot water room heat exchanger 5
Since the air is heated in b, the conditioned room is heated.

During the heating operation, heating using the refrigerant indoor heat exchanger 5a and heating using the hot water indoor heat exchanger 5b are switched and operated according to the difference between the set temperature and the room temperature. When the difference between the set temperature and the room temperature is large, heating using the hot water indoor heat exchanger 5b is performed, and when the difference between the set temperature and the room temperature is small, heating using the refrigerant indoor heat exchanger 5a is performed, and switching is performed according to the capacity request. Controlling the room temperature.

FIG. 2 is a diagram showing the operation / stop of the refrigerant compressor and the opening / closing of the flow rate variable valve for hot water circulation with respect to the change in the difference between the room temperature and the set temperature.

When the heating operation is started in the region A in the figure, since the difference between the room temperature and the set temperature is large, the heating operation is performed using the hot water indoor heat exchanger 5b. The flow rate variable valve 6 is fully opened, hot water is supplied into the hot water indoor heat exchanger 5b, and the surrounding air is heated and blown into the room. When the room temperature rises, for example, when the room temperature rises above a temperature P1 (first temperature) lower by 1 ° C. than the set temperature, the operation of the refrigerant compressor 12 is started, and the heated refrigerant is supplied to the refrigerant indoor heat exchanger. 5a, an operation is performed in which heating using the refrigerant indoor heat exchanger 5a and heating using the hot water indoor heat exchanger 5b are used in combination. As described above, in this state, the difference between the room temperature and the set temperature is small, and the air temperature is considerably high, so that the valve opening of the variable flow rate valve 6 is at the minimum position.

When such a heating state is continued and the temperature rises to a temperature P4 (a fourth temperature lower than the set temperature and higher than the first temperature P1) at which the room temperature and the set temperature substantially match, the flow rate is increased. The variable valve 6 closes and the heat exchanger 5b in the hot water room
The supply of warm water to the inside is stopped, and heating is switched to only the refrigerant indoor heat exchanger 5a.

At this time, at the time point P1, the temperature of the indoor heat exchanger 5 is higher than the temperature of the hot water indoor heat exchanger 5b at the time point P1.
a is started and combined operation with heating using the hot water indoor heat exchanger 5b is performed, the refrigerant indoor heat exchanger 5
a, the temperature difference between the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b gradually disappears, and at the time point P4, the temperature is maintained at substantially the same temperature, and thereafter, the refrigerant heat exchanger 5a
Only the room will be heated.

In this way, when switching from the heating using the hot water indoor heat exchanger 5b to the heating using the refrigerant indoor heat exchanger 5a, the heating using the refrigerant indoor heat exchanger 5a and the hot water By providing a period in which the heating and the heat using the heat exchanger 5b are operated in combination, the refrigerant indoor heat exchanger 5a
When the operation of the refrigerant indoor heat exchanger 5a can be switched to the operation after the refrigerant and the hot water indoor heat exchanger 5b have substantially the same temperature, the heating using the hot water indoor heat exchanger 5b and the refrigerant indoor heat exchanger 5a The hunting phenomenon with the heating using is prevented. That is, when the room temperature rises by heating using the hot water indoor heat exchanger 5b, the refrigerant indoor heat exchanger 5a
When the heating is immediately switched to the heating using the indoor heat exchanger 5a, the temperature of the indoor heat exchanger 5 is temporarily lowered due to insufficient heating using the refrigerant indoor heat exchanger 5a. At this time, the control device 18 that switches the operation of the indoor heat exchanger 5 returns to the combined operation of the hot water indoor heat exchanger 5b immediately after switching to the operation of the refrigerant indoor heat exchanger 5a. The decrease in temperature is erroneously recognized as a lack of the heating capacity, and the temperature of the indoor heat exchanger 5 rises, and thereafter, the operation again switches to the operation of the refrigerant indoor heat exchanger 5a, and returns to the combined operation. Alternatively, the hunting phenomenon of the hot water indoor heat exchanger 5b is eliminated by providing the above combined operation period, and the heating using the hot water indoor heat exchanger 5b is stopped after the temperature of the indoor heat exchanger 5 is stabilized. In addition, it is possible to suppress fluctuations in the temperature of air blown into the room. In addition, the heating using the refrigerant indoor heat exchanger 5a is superior in controlling a small heating capacity as compared with the heating using the hot water indoor heat exchanger 5b. The operation which repeats the operation and the stop of Step 5 can be avoided, and a more stable room temperature can be maintained.

Thus, the heating of the refrigerant indoor heat exchanger 5a alone is continued. When the situation changes and the heating capacity becomes insufficient for the heating load due to the influence of the outside air introduced into the room or the like, the room temperature gradually decreases, and sufficient heating cannot be performed by the heating using the refrigerant indoor heat exchanger 5a. (B region) In the B region of the drawing, the room temperature is set to a value lower than the set temperature, for example,
At a temperature P3 (third temperature) that has dropped by not less than ° C., the variable flow valve 6 is opened, and the heating operation using the hot water indoor heat exchanger 5b is started. The heating operation using the refrigerant indoor heat exchanger 5a is also performed, and the combined operation using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b is performed.

This operation is an operation for switching to the hot water temperature by predicting that the heating operation capacity will be insufficient in the simple combined operation. Since the variable flow rate valve 6 heats in a state close to the closed state, the refrigerant chamber The temperature of the heat exchanger 5a gradually decreases, and the room temperature drops to a temperature P2 (second temperature) lower than P3.

At a time point P2 (second temperature) at which the room temperature falls by 3 ° C. or more from the set temperature, the heating operation using the refrigerant indoor heat exchanger 5a is stopped, and the hot water supply amount is adjusted by the flow rate variable valve 6. The heating operation is performed only for the hot water indoor heat exchanger 5a that controls the heating capacity.

When switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b,
In the same manner as when switching from the hot water heating to the heating using the refrigerant indoor heat exchanger 5a, the period in which the heating using the hot water indoor heat exchanger 5b and the heating using the refrigerant indoor heat exchanger 5a are operated in combination is set. Provided. By providing a combined operation period, the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b
After the temperature has become substantially the same, the heat exchanger 5
b, the hunting phenomenon of the refrigerant indoor heat exchanger 5a or the hot water indoor heat exchanger 5b, such as switching back to the operation of the refrigerant indoor heat exchanger 5a and returning to the combined operation, is eliminated. Since the temperature of the heat exchanger 5 is stabilized, fluctuations in the temperature of air blown into the room can be suppressed.

As described above, when switching from the heating using the refrigerant indoor heat exchanger 5a to the heating using the hot water indoor heat exchanger 5b, and from the heating using the hot water indoor heat exchanger 5b to the heating, the refrigerant indoor heat exchanger 5a is removed. When switching to the used heating,
By providing a period for the combined operation, switching can be smoothly performed at a stable room temperature.

When the difference between the room temperature and the set temperature is large, the room temperature is quickly started by heating using the hot water indoor heat exchanger 5b, and when the difference between the room temperature and the set temperature becomes small and low capacity is required, Heating is performed using the refrigerant indoor heat exchanger 5a which is excellent in controlling a small heating capacity, and stable room temperature control can be performed.

Further, the gas charge for heating using the hot water indoor heat exchanger 5b is reduced by the refrigerant indoor heat exchanger 5a.
The electricity rate when heating with is cheaper,
When a low capacity is required, heating using the refrigerant indoor heat exchanger 5a having a low running cost is performed, and an economical heating operation can be performed.

Further, when considering household energy, since electricity consumption is low and gas consumption is high in the heating season, switching from gas to electricity for heating contributes to energy leveling. be able to. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a refrigerant circuit diagram showing a second embodiment of the present invention. Note that the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only different components will be described.

In FIG. 3, a refrigerant temperature sensor 33 is attached to the refrigerant indoor heat exchanger 5a, and a hot water temperature sensor 34 is attached to the hot water indoor heat exchanger 5b. , The temperature of the hot water indoor heat exchanger 5b is detected.

The controller 18 is connected to the refrigerant compressor 12, the variable flow valve 6, the room temperature sensor 8, the refrigerant temperature sensor 33, and the hot water temperature sensor 34, and detects the difference between the temperature detected by the room temperature sensor 8 and the set temperature. A temperature comparing means (not shown) for comparison is provided. The control device 18 includes these temperature comparison means, a refrigerant temperature sensor 33 and a hot water temperature sensor 34.
The cooling capacity and the heating capacity are controlled by controlling the rotation speed of the refrigerant compressor 12 and the valve opening of the variable flow rate valve 6 on the basis of the detected temperature.

FIG. 4 is a diagram showing the operation / stop of the refrigerant compressor and the opening / closing of the variable flow valve with respect to the change in the difference between the temperature of the indoor heat exchanger and the set temperature during heating.

When the heating operation is started in the region A in the figure, since the difference between the room temperature and the set temperature is large, the heating operation using the hot water indoor heat exchanger 5b is performed. Variable flow valve 6
Is fully opened, hot water is supplied into the hot water indoor heat exchanger 5b, the surrounding air is heated, and the heated air is blown into the room. When the room temperature rises and the room temperature rises to a temperature P5 (fifth temperature) about 1 ° C. lower than the set temperature, the refrigerant compressor 12 is operated to perform heating using the refrigerant indoor heat exchanger 5a and heat in the hot water indoor. The heating using the exchanger 5b is operated in combination. At this time, the valve opening of the flow rate variable valve 6 of the hot water circulation circuit is at the minimum position, and the temperature of the refrigerant indoor heat exchanger 5a becomes the same as the temperature of the hot water indoor heat exchanger 5b. After the temperature of the hot water indoor heat exchanger 5b matches the temperature of the refrigerant indoor heat exchanger 5a (Q1), until a predetermined time elapses (for example, 1
Min) Continue the combined operation. Thereafter, the flow variable valve 6 is closed to stop the supply of the hot water into the hot water indoor heat exchanger 5b. Thereby, the operation is switched to only the heating operation using the refrigerant indoor heat exchanger 5a.

In this way, when switching from heating using the hot water indoor heat exchanger 5b to heating using the refrigerant indoor heat exchanger 5a, the heating using the refrigerant indoor heat exchanger 5a and the hot water By providing a period in which the heating and the heat using the heat exchanger 5b are operated in combination, the refrigerant indoor heat exchanger 5a
Since the operation of the indoor heat exchanger 5a is switched to the operation of the indoor heat exchanger 5a after the temperature of the indoor heat exchanger 5a and the hot water indoor heat exchanger 5b reach substantially the same temperature, the control device 18 for switching the operation of the indoor heat exchanger 5 Immediately after the operation is switched to the operation, the combined operation of the hot water indoor heat exchanger 5b is performed again, and then the operation is switched to the operation of the refrigerant indoor heat exchanger 5a again, and the operation returns to the combined operation. Since the hunting phenomenon of the indoor heat exchanger 5b is eliminated, and the temperature of the indoor heat exchanger 5 is stabilized, it is possible to suppress fluctuations in the temperature of air blown into the room.

In region B of the drawing, the refrigerant indoor heat exchanger 5
When heating using a is performed, when the room temperature drops due to the influence of outside air introduced into the room, for example, when the room temperature drops to a temperature P6 (sixth temperature) lower than the set temperature by 2 ° C. or more. Then, the flow variable valve 6 is opened, and the heating operation using the hot water indoor heat exchanger 5b is started. The heating operation using the refrigerant indoor heat exchanger 5a is also performed, and the combined operation using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b is performed. If the heating load increases temporarily, the room temperature approaches the set temperature a while later, and the operation returns to the single operation using the refrigerant indoor heat exchanger 5a again. The operating capacity is insufficient, and the temperature of the indoor heat exchanger 5 keeps gradually decreasing.

However, the heat exchanger 5 in the hot water room for a certain time or more.
When the hot water is circulated through b, the temperature of the hot water indoor heat exchanger 5b rises and a predetermined time elapses after the temperature of the hot water indoor heat exchanger 5b matches the temperature of the refrigerant indoor heat exchanger 5a (Q2). The combined operation is continued until (for example, 1 minute). Thereafter, the operation of the refrigerant compressor 12 is stopped, and the heating operation using the refrigerant indoor heat exchanger 5a is stopped. As a result, the operation is switched to the heating only operation using the hot water indoor heat exchanger 5b, and the heating capacity of the hot water indoor heat exchanger 5b is changed to the flow rate variable valve 6
Is controlled by the valve opening.

In this case, as in the first embodiment, when switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b, the hot water indoor heat exchanger 5b is used.
By providing a period in which the heating using the air conditioner and the heating using the refrigerant indoor heat exchanger 5a are used in combination, after the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b have substantially the same temperature, Since the operation is switched to the operation of the hot water indoor heat exchanger 5b, the hunting of the refrigerant indoor heat exchanger 5a or the hot water indoor heat exchanger 5b is thereafter switched to the operation of the refrigerant indoor heat exchanger 5a again and returned to the combined operation. Since the phenomenon disappears and the temperature of the indoor heat exchanger 5 is stabilized, it is possible to suppress fluctuations in the temperature of air blown into the room.

As described above, when switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b, and from heating using the hot water indoor heat exchanger 5b, the refrigerant indoor heat exchanger 5a is removed. When switching to the used heating,
By providing a period for the combined operation, switching can be smoothly performed at a stable room temperature.

When the difference between the room temperature and the set temperature is large, the room temperature is quickly started by heating using the hot water indoor heat exchanger 5b, and when the difference between the room temperature and the set temperature becomes small and low capacity is required, Heating is performed using the refrigerant indoor heat exchanger 5a which is excellent in controlling a small heating capacity, and stable room temperature control can be performed.

Further, the gas rate for heating using the hot water indoor heat exchanger 5b is reduced by the refrigerant indoor heat exchanger 5a.
The electricity rate when heating with is cheaper,
When a low capacity is required, heating using the refrigerant indoor heat exchanger 5a having a low running cost is performed, and an economical heating operation can be performed. Third Embodiment FIG. 5 is a refrigerant circuit diagram showing an air conditioner according to a third embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The outdoor unit 2 and the heat source unit 3 are of a multi-type, and the outdoor unit 2 and the heat source unit 3 have two indoor units 1
A and 1B are connected by an inter-unit piping 16a for refrigerant and an inter-unit piping 26a for hot water, respectively, to form a multi-type air conditioner.

In a multi-type air conditioner, for example,
There is a case where one indoor unit 1A is used for air conditioning in a living room or the like, and the other indoor unit 1B is used for air conditioning in a corridor, toilet, bathroom, utility, or the like.
A and 1B also include a refrigerant indoor heat exchanger 5a and a hot water indoor heat exchanger 5b similar to those shown in FIGS. 1 and 3, and a switching operation in which a combined operation period similar to that of the first embodiment or the second embodiment is provided. Control is performed.

When one of the indoor units of the multi-type air conditioner, for example, the indoor unit 1B is installed in a toilet, a bathroom, a utility, or the like where the air conditioner 4 is operated for a long time with a low heating capacity. Most of the time, the heating operation using the refrigerant indoor heat exchanger 5a having a low running cost can be performed, whereby the air conditioning can be performed economically and at a stable room temperature.

As described above, the present invention has been described based on the respective embodiments. However, the present invention is not limited to these embodiments. Although the present embodiment has been described with reference to a home air conditioner, the present invention can also be used in a commercial air conditioner.

[0053]

As described above, according to the present invention,
When the difference between the room temperature and the set temperature is large, heating using an indoor heat exchanger to which hot water is supplied is performed, and when the difference between the room temperature and the set temperature is small and low capacity is required, a refrigerant excellent in controlling a small heating capacity is used. By switching to the heating using the indoor heat exchanger supplied with, the heating operation in consideration of energy saving can be performed. In addition, when switching between heating using an indoor heat exchanger supplied with hot water and heating using an indoor heat exchanger supplied with refrigerant, heating and refrigerant supplied using an indoor heat exchanger supplied with hot water are used. By providing the combined operation period with heating using the indoor heat exchanger, the indoor heat exchanger temperature can be stabilized, and control with less room temperature fluctuation can be performed. Also, when the room temperature is stable or when a low capacity is required, heating using an indoor heat exchanger to which a refrigerant having a low running cost is supplied can be performed to perform an economical heating operation.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing operation / stop of a refrigerant compressor and opening / closing of a flow rate variable valve of a hot water circulation circuit with respect to a change in a difference between a room temperature and a set temperature in the first embodiment of the present invention.

FIG. 3 is a refrigerant circuit diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing operation / stop of a refrigerant compressor and opening / closing of a flow rate variable valve with respect to a change in a difference between a temperature of an indoor heat exchanger and a set temperature in a second embodiment of the present invention.

FIG. 5 is a refrigerant circuit diagram showing a third embodiment of the present invention.

[Explanation of symbols]

1, 1A, 1B Indoor unit 2 Outdoor unit 3 Heat source unit 4 Air conditioner 5 Indoor heat exchanger 5a Indoor heat exchanger supplied with refrigerant 5b Indoor heat exchanger supplied with hot water 6 Flow rate variable valve (hot water control valve) 8) Room temperature sensor 12 Refrigerant compressor 13 Outdoor heat exchanger 14 Four-way valve 16 Refrigerant pipe 16a Piping between units for refrigerant 17 Electric expansion valve 18 Controller 22 Heater 23 Hot water heat exchanger 26 Hot water pipe 26a Between units for hot water Piping 33 Refrigerant temperature sensor (refrigerant temperature detecting means) 34 Hot water temperature sensor (hot water temperature detecting means) P1 First temperature (temperature at start of operation of refrigerant compressor) P2 Second temperature (temperature at stop of operation of refrigerant compressor) P3 Third temperature (temperature when variable flow rate valve is opened) P4 fourth temperature (temperature when variable flow rate valve is closed) P5 fifth temperature P6 sixth temperature Q1, Q2 refrigerant temperature sensor Detection temperature match point of the hot water temperature sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Yamauchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3L060 AA06 DD07 EE02 EE33

Claims (5)

[Claims] 1. A refrigeration cycle including a refrigerant compressor, an indoor heat exchanger to which a refrigerant is supplied, and a hot water circulation circuit including a hot water control valve, an indoor heat exchanger to which hot water is supplied, and the like. An air conditioner that performs heating operation using either an indoor heat exchanger supplied with a refrigerant or an indoor heat exchanger supplied with hot water, wherein heating using the indoor heat exchanger supplied with a refrigerant is performed. When switching between the operation and the heating operation using the indoor heat exchanger supplied with hot water, the heating operation using the indoor heat exchanger supplied with refrigerant and the heating operation using the indoor heat exchanger supplied with hot water are performed. An air conditioner having a control device that performs a combined operation. 2. The control device opens the hot water control valve when the room temperature is equal to or lower than a third temperature lower than the set temperature, and increases the room temperature above a fourth temperature higher than the set temperature and lower than the third temperature. 2. The air conditioner according to claim 1, wherein the air conditioner is controlled to close when the air conditioner is closed. 3. The control device starts the operation of the refrigerant compressor when a room temperature rises to a first temperature higher than a third temperature and lower than a fourth temperature, and the room temperature is lower than the third temperature. 3. The air conditioner according to claim 2, wherein the control is performed so as to stop the operation when the temperature falls below the lower second temperature. 4. A refrigeration cycle including a refrigerant compressor, an indoor heat exchanger to which a refrigerant is supplied, and a hot water circulation circuit including a hot water control valve, an indoor heat exchanger to which hot water is supplied, and the like. An air conditioner that performs heating operation using either an indoor heat exchanger supplied with a refrigerant or an indoor heat exchanger supplied with hot water, wherein heating using the indoor heat exchanger supplied with a refrigerant is performed. When switching between the operation and the heating operation using the indoor heat exchanger supplied with hot water, the heating operation using the indoor heat exchanger supplied with refrigerant and the heating operation using the indoor heat exchanger supplied with hot water are performed. The controller has a control device that performs the combined operation, and after the combined operation is started, after the temperature of the indoor heat exchanger to which the refrigerant is supplied and the temperature of the indoor heat exchanger to which the hot water is supplied match. , Until the specified time elapses Air conditioner and performs the operation. 5. When performing a heating operation using an indoor heat exchanger to which hot water is supplied, when the room temperature rises to a fifth temperature lower than the set temperature, the air conditioner operates and the refrigerant is operated. When switching to the heating operation using the supplied indoor heat exchanger and performing the heating operation using the indoor heat exchanger supplied with the refrigerant, the room temperature drops to the sixth temperature lower than the fifth temperature. The air conditioner according to claim 4, wherein the air conditioner switches the operation to a heating operation using an indoor heat exchanger to which hot water is supplied.